Buggy code:
if ( ( ! ( "" . equals ( servletPackageName ) ) ) && ( servletPackageName != null ) ) { writer . println ( ( ( "package<seq2seq4repair_space>" + servletPackageName ) + ";" ) ) ; writer . println ( ) ; } Enumeration e = imports . elements ( ) ; while ( e . hasMoreElements ( ) ) writer . println ( ( ( "import<seq2seq4repair_space>" + ( ( String ) ( e . nextElement ( ) ) ) ) + ";" ) ) ; writer . println ( ) ; generateAll ( FileDeclarationPhase . class ) ; writer . println ( ) ; writer . print ( ( ( "public<seq2seq4repair_space>class<seq2seq4repair_space>" + servletClassName ) + "<seq2seq4repair_space>extends<seq2seq4repair_space>" ) ) ; writer . print ( ( extendsClass . equals ( "" ) ? jspServletBase : extendsClass ) ) ; if ( singleThreaded ) interfaces . addElement ( "SingleThreadModel" ) ; if ( ( interfaces . size ( ) ) != 0 ) { writer . println ( ) ; writer . println ( "<seq2seq4repair_space>implements<seq2seq4repair_space>" ) ; for ( int i = 0 ; i < ( ( interfaces . size ( ) ) - 1 ) ; i ++ ) writer . println ( ( ( "<seq2seq4repair_space>" + ( interfaces . elementAt ( i ) ) ) + "," ) ) ; writer . println ( ( "<seq2seq4repair_space>" + ( interfaces . elementAt ( ( ( interfaces . size ( ) ) - 1 ) ) ) ) ) ; } writer . println ( "<seq2seq4repair_space>{" ) ; writer . pushIndent ( ) ; writer . println ( ) ; generateAll ( ClassDeclarationPhase . class ) ; writer . println ( ) ; writer . println ( "static<seq2seq4repair_space>{" ) ; writer . pushIndent ( ) ; generateAll ( StaticInitializerPhase . class ) ; writer . popIndent ( ) ; writer . println ( "}" ) ; writer . println ( ( ( "public<seq2seq4repair_space>" + servletClassName ) + "(<seq2seq4repair_space>)<seq2seq4repair_space>{" ) ) ; writer . println ( "}" ) ; writer . println ( ) ; writer . println ( "private<seq2seq4repair_space>boolean<seq2seq4repair_space>_jspx_inited<seq2seq4repair_space>=<seq2seq4repair_space>false;" ) ; writer . println ( ) ; writer . println ( "public<seq2seq4repair_space>final<seq2seq4repair_space>synchronized<seq2seq4repair_space>void<seq2seq4repair_space>_jspx_init()<seq2seq4repair_space>throws<seq2seq4repair_space>org.apache.jasper.JasperException<seq2seq4repair_space>{" ) ; writer . pushIndent ( ) ; writer . println ( "if<seq2seq4repair_space>(!<seq2seq4repair_space>_jspx_inited)<seq2seq4repair_space>{" ) ; writer . pushIndent ( ) ; generateAll ( InitMethodPhase . class ) ; writer . println ( "_jspx_inited<seq2seq4repair_space>=<seq2seq4repair_space>true;" ) ; writer . popIndent ( ) ; writer . println ( "}" ) ; writer . popIndent ( ) ; writer . println ( "}" ) ; writer . println ( ) ; writer . println ( ( ( ( ( "public<seq2seq4repair_space>void<seq2seq4repair_space>" + ( serviceMethodName ) ) + "(" ) + "HttpServletRequest<seq2seq4repair_space>request,<seq2seq4repair_space>" ) + "HttpServletResponse<seq2seq4repair_space>response)" ) ) ; writer . println ( "<seq2seq4repair_space>throws<seq2seq4repair_space>java.io.IOException,<seq2seq4repair_space>ServletException<seq2seq4repair_space>{" ) ; writer . pushIndent ( ) ; writer . println ( ) ; writer . println ( "JspFactory<seq2seq4repair_space>_jspxFactory<seq2seq4repair_space>=<seq2seq4repair_space>null;" ) ; writer . println ( "PageContext<seq2seq4repair_space>pageContext<seq2seq4repair_space>=<seq2seq4repair_space>null;" ) ; if ( genSessionVariable ) writer . println ( "HttpSession<seq2seq4repair_space>session<seq2seq4repair_space>=<seq2seq4repair_space>null;" ) ; if ( ctxt . isErrorPage ( ) ) writer . println ( "Throwable<seq2seq4repair_space>exception<seq2seq4repair_space>=<seq2seq4repair_space>(Throwable)<seq2seq4repair_space>request.getAttribute(\"javax.servlet.jsp.jspException\");" ) ; writer . println ( "ServletContext<seq2seq4repair_space>application<seq2seq4repair_space>=<seq2seq4repair_space>null;" ) ; writer . println ( "ServletConfig<seq2seq4repair_space>config<seq2seq4repair_space>=<seq2seq4repair_space>null;" ) ; writer . println ( "JspWriter<seq2seq4repair_space>out<seq2seq4repair_space>=<seq2seq4repair_space>null;" ) ; writer . println ( "Object<seq2seq4repair_space>page<seq2seq4repair_space>=<seq2seq4repair_space>this;" ) ; writer . println ( "String<seq2seq4repair_space>_value<seq2seq4repair_space>=<seq2seq4repair_space>null;" ) ; writer . println ( "try<seq2seq4repair_space>{" ) ; writer . pushIndent ( ) ; writer . println ( "try<seq2seq4repair_space>{" ) ; writer . pushIndent ( ) ; writer . println ( ) ; writer . println ( "_jspx_init();" ) ; writer . println ( "_jspxFactory<seq2seq4repair_space>=<seq2seq4repair_space>JspFactory.getDefaultFactory();" ) ; if ( ( this . contentTypeDir ) == true ) writer . println ( ( ( "response.setContentType(" + ( writer . quoteString ( servletContentType ) ) ) + ");" ) ) ; else <START_BUG> writer . println ( ( ( "response.setContentType(\"" + ( servletContentType ) ) + ";charset=8859_1\");" ) ) ; <END_BUG> writer . println ( ( ( ( ( ( ( ( ( ( "pageContext<seq2seq4repair_space>=<seq2seq4repair_space>_jspxFactory.getPageContext(this,<seq2seq4repair_space>request,<seq2seq4repair_space>response,\n" + "\t\t\t" ) + ( writer . quoteString ( error ) ) ) + ",<seq2seq4repair_space>" ) + ( genSessionVariable ) ) + ",<seq2seq4repair_space>" ) + ( bufferSize ) ) + ",<seq2seq4repair_space>" ) + ( autoFlush ) ) + ");" ) ) ; writer . println ( ) ; writer . println ( "application<seq2seq4repair_space>=<seq2seq4repair_space>pageContext.getServletContext();" ) ; writer . println ( "config<seq2seq4repair_space>=<seq2seq4repair_space>pageContext.getServletConfig();" ) ; if ( genSessionVariable ) writer . println ( "session<seq2seq4repair_space>=<seq2seq4repair_space>pageContext.getSession();" ) ; writer . println ( "out<seq2seq4repair_space>=<seq2seq4repair_space>pageContext.getOut();" ) ; } private void generateFooter ( ) throws JasperException { } public void handleComment ( Mark start , Mark stop ) throws JasperException { } interface PageDirectiveHandler { void handlePageDirectiveAttribute ( JspParseEventListener listener , String value , Mark start , Mark stop ) throws JasperException { } } static final class PageDirectiveHandlerInfo { String attribute ; JspParseEventListener . PageDirectiveHandler handler ; PageDirectiveHandlerInfo ( String attribute , JspParseEventListener . PageDirectiveHandler handler ) { } } static final String languageStr = "language" ; static final String extendsStr = "extends" ; static final String importStr = "import" ; static final String sessionStr = "session" ; static final String bufferStr = "buffer" ; static final String autoFlushStr = "autoFlush" ; static final String isThreadSafeStr = "isThreadSafe" ; static final String infoStr = "info" ; static final String errorPageStr = "errorPage" ; static final String isErrorPageStr = "isErrorPage" ; static final String contentTypeStr = "contentType" ;

Fix:
writer . println ( ( ( "response.setContentType(\"" + ( servletContentType ) ) + ";charset=ISO-8859-1\");" ) ) ;